No But the Caliber is the same but theres more powder in the 223
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no that is a 3-0-8 it is 30 caliber a 223 is 5.56 mm it is 22.3 caliber
Yes there is a difference. They are physically the same size casing, but the 556 military rounds' chamber pressure is ~10,000 psi higher then 223. Military rifles generally have chambers with a different throat configuration than normal sport 223 rifles. This being said, I would not recommend shooting 556 unless your rifle was designed for the higher pressures.
The factors of 223 are: 1, 223
223
223 and 1